I do not know if there exist any ready packages for thsi, but it is easy
enough to produce "manually", starting with the Graphics`Arrow` package.
Here is an example I just worked out, it is not very accurate as I chose the
numbers basically at random but it should give you an idea of the kind of
thing you can do:
In[15]:=
<< "Graphics`Arrow`"
In[107]:=
angle = Pi/4; pl = ParametricPlot[{Cos[t], Sin[t]},
{t, 0, angle}, AspectRatio -> Automatic, Axes -> False,
DisplayFunction -> Identity];
P = {Cos[angle], Sin[angle]};
T = {-Sin[angle], Cos[angle]};
ar = Graphics[Arrow[P, P + 0.2*T, HeadLength -> 0.5]];
rt = Rectangle[{0.5, 0.}, {1, 0.6}, gr];
Show[Graphics[{Line[{{1, 1}, {0, 0}, {1, 0}}], rt}],
DisplayFunction -> $DisplayFunction];
on 01.5.11 4:38 PM, Jose Capco at jcapco at mathematik.uni-ulm.de wrote:
> Dear NG,
>
> I wish to draw a figure in Mathematica that involves indicating the angle of
> some triangle. I thought that the only way to do it is to make acurved arrow
> (I
> hope you know what I mean), please advise me on how I can do this. Thanks in
> advance
>
> Sincerely,
> Jose Capco
>
>
--
Andrzej Kozlowski
Toyama International University
JAPAN
http://platon.c.u-tokyo.ac.jp/andrzej/http://sigma.tuins.ac.jp/~andrzej/